Today there are lots of post-rock bands out there, but almost all of them sounds the same imo. Mogwai is nice tho, but my all time favourite will always be Godspeed.
5:32 Melts your fucking face, if you are in the right mood for it.
I strongly recommend any of their albums to anybody who missed them out so far. Unless the first one, due to the fact that it has only been released on exactly 33 tapes, and afaik there is no valid rip on the interwebz so far.
Also, some firs wave post-rock:
And another one, which I won't hide. One of my favourite tracks of all time.
That 6:50 gives me the goosebumps.